JP5561540B2 - Terminal fitting and method of manufacturing terminal fitting - Google Patents

Description

  The present invention relates to a terminal fitting and a method for manufacturing the terminal fitting.

As electric wires routed indoors, in recent years, from the viewpoint of weight reduction of vehicles, demand for aluminum electric wires in which an aluminum or aluminum alloy core wire is covered with an insulating coating is increasing. As a terminal metal fitting connected to an aluminum electric wire, it is common to use what was produced using the metal plate material made from copper or a copper alloy by the problem of intensity | strength.
Moreover, in the terminal of an aluminum electric wire, the core wire exposed by exfoliation removal of the insulating film is crimped | bonded and connected with the barrel piece of the terminal metal fitting.

Therefore, in the connection part (electric wire connection part) with the electric wire of the terminal fitting, since different types of metals such as aluminum or aluminum alloy constituting the core wire of the electric wire and copper or copper alloy constituting the terminal fitting are in contact with each other, There is concern over the occurrence of electrolytic corrosion due to the intrusion of water containing an electrolyte such as salt into the contact portion between the core wire and the terminal fitting.
Therefore, conventionally, a terminal fitting that prevents the occurrence of electrolytic corrosion has been studied (for example, see Patent Document 1).

JP 2004-111058 A

In the terminal fitting proposed in Patent Document 1, the part to which the aluminum wire is connected is formed from aluminum or an aluminum alloy, the part to be connected to the other terminal is formed from copper or a copper alloy, and the wire is connected. And the end of the portion to which the terminal is connected are overlapped, and the overlapped portion is sealed with an insulator.
Therefore, in the thing of patent document 1, since the part where the edge part of an electric wire connection part and the edge part of a terminal connection part overlap will become thick or a level | step difference will be formed, a bending process is performed. There was a problem that it was difficult.

  The present invention has been completed based on the above circumstances, and an object thereof is to provide a terminal fitting that can prevent the occurrence of electrolytic corrosion and can be easily bent, and a method for manufacturing the same. To do.

In order to solve the above-mentioned problems, the present invention provides a terminal fitting having a wire connecting portion for placing and electrically connecting an electric wire formed by coating a core wire with an insulating coating, the metal material included in the core wire A first metal material containing the same metal, a second metal material made of a metal different from the first metal material, and an ionization tendency between the second metal material and the first metal material A first metal part made of the first metal material and a third metal material made of the first metal material, and a third metal material made of the first metal material. And a metal plate material provided with a third metal portion made of the third metal material between the first metal portion and the second metal portion. , Exposed from at least the end of the wire among the wire connecting portion That the core wire connecting portion core wire is connected, is formed on the first metal portion, said bonding surface of said third metal section of the first metal portion and, said second metal part first 3 is a terminal fitting characterized in that the joint surface with the metal part 3 has a stepped cross section .

  1st metal part which the core wire connection part to which a core wire is connected among the electric wire connection parts of the terminal metal fitting of this invention consists of the 1st metal material containing the same metal material as the core wire of an electric wire. Is formed. That is, according to the present invention, since the core wire connecting portion to which the core wire of the electric wire and the core wire of the electric wire are connected is composed of the same metal, the moisture containing the electrolyte in the portion where the core wire and the terminal fitting are in contact with each other. Even if it adheres, electric corrosion does not occur.

By the way, in a terminal fitting using a metal plate material formed by joining a part containing the same metal as the metal material contained in the core wire and a part made of another metal material, moisture containing an electrolyte is present at the boundary between the two parts. When adhered, if the difference in ionization tendency between the metal materials constituting the two portions is large, there is a concern about the occurrence of electrolytic corrosion at the boundary portion.
However, in the present invention, a third metal portion having an ionization tendency of a metal material between the first metal material and the second metal material is provided between the first metal portion and the second metal portion. Since it is provided, compared with the case where the 1st metal part and the 2nd metal part are joined, the boundary part (the boundary part of the 1st metal part and the 3rd metal part, and the 3rd metal part) Electrical corrosion is unlikely to occur at the boundary portion between the second metal portion and the second metal portion. As a result, according to the present invention, electrolytic corrosion is unlikely to occur at portions where different metal materials are joined.

In the present invention, the metal plate constituting the terminal fitting is integrated by cold-welding the first metal material, the second metal material, and the third metal material, and the first metal portion and Since the portion where the third metal portion is joined and the portion where the third metal portion and the second metal portion are joined are substantially the same thickness as the other portions and there is no step, bending is performed. Etc. can be easily performed.
As described above, according to the present invention, it is possible to provide a terminal fitting that can prevent the occurrence of electrolytic corrosion and can be easily bent.

In the present invention, the joining surfaces of the third metal of the first metal part and the joining surface between the third metal portion of said second metal portion, that have no cross-sectional stepped.
With such a configuration, even if electrolytic corrosion occurs on the surface in the thickness direction of the terminal fitting, the distance between the first metal portion and the second metal portion becomes longer as the electrolytic corrosion progresses, so the electrolytic corrosion is halfway. Stop at. Moreover, by setting it as such a structure, the bending strength in a junction part becomes high and a terminal metal fitting can be made excellent in intensity | strength.
The terminal fitting of the present invention may have the following configuration.

An insulating layer made of an insulating material may be formed so as to cover at least a boundary portion between the first metal portion and the third metal portion.
As described above, electrolytic corrosion is unlikely to occur at the boundary between dissimilar metals in the terminal fitting of the present invention. However, since different metals exist at the boundary between different metals, when the terminal fitting is placed in a harsh environment (for example, in a high temperature environment), if water containing an electrolyte enters the boundary, the battery is charged. There is concern about the occurrence of food. In particular, as the first metal material that constitutes the first metal part, a metal that is more susceptible to corrosion than the second metal material that constitutes the second metal part is often selected. Electrolytic corrosion is more likely to occur in the boundary portion between the third metal portion and the third metal portion than in the boundary portion between the third metal portion and the second metal portion. Therefore, with the above configuration, since an insulating layer is formed to cover the boundary portion between the first metal portion and the third metal portion where the dissimilar metal exists, generation of electrolytic corrosion at the boundary portion is prevented. It can be surely prevented.

  The said structure WHEREIN: When the said insulating layer is formed so that the boundary part of the said 3rd metal part and the said 2nd metal part may be covered, the boundary of a 3rd metal part and a 2nd metal part The occurrence of electrolytic corrosion in the portion can be reliably prevented, which is preferable.

  The core wire may be made of aluminum or an aluminum alloy, and the second metal material may be copper or a copper alloy. With such a configuration, the electric wire can be reduced in weight, and the terminal fitting can be excellent in strength.

Moreover, as a solution to the above-mentioned problem, the present invention provides a method of manufacturing a terminal fitting having a wire connecting portion for placing and electrically connecting an electric wire formed by coating a core wire with an insulating coating, A first metal material containing the same metal as the contained metal material, a second metal material made of a metal different from the first metal material, and an ionization tendency of the second metal material and the first metal material A third metal material made of metal between the metal material and the first metal part made of the first metal material and the second metal material are integrated by cold pressure welding. A metal plate having a third metal portion made of the third metal material between the first metal portion and the second metal portion is prepared in parallel with the second metal portion. After executing the plate material manufacturing process, an insulating layer made of an insulating material is An insulating layer forming step for forming at least a boundary portion between the first metal portion and the third metal portion is performed, and the metal plate material after the insulating layer forming step is performed is the wire connecting portion. Performing a punching process in which at least a portion corresponding to the core wire connecting portion to which the core wire exposed from the end of the electric wire is connected is formed in the first metal portion of the metal plate material. In the plate material manufacturing step, the first metal material, the second metal material, and the third metal material may be bonded to the third metal portion of the first metal portion, and A method of manufacturing a terminal fitting in which the joint surface of the second metal part with the third metal part is cold-welded and integrated so as to form a stepped cross section .

  In the terminal fitting obtained by the manufacturing method of the present invention, as in the terminal fitting of the present invention, at least the core wire connecting portion to which the core wire is connected among the electric wire connecting portions includes the same metal material as the core wire of the electric wire. It is formed in the first metal part made of a metal material. That is, according to the present invention, since the core wire connecting portion to which the core wire of the electric wire and the core wire of the electric wire are connected is composed of the same metal, the moisture containing the electrolyte in the portion where the core wire and the terminal fitting are in contact with each other. Even if it adheres, electric corrosion does not occur.

  In the present invention, the ionization tendency includes a third metal portion made of a metal material between the first metal material and the second metal material between the first metal portion and the second metal portion. Further, electrolytic corrosion is unlikely to occur at the boundary portion of the dissimilar metal (the boundary portion between the first metal portion and the third metal portion and the boundary portion between the third metal portion and the second metal portion). As a result, according to the present invention, electrolytic corrosion is unlikely to occur at portions where different metal materials are joined.

  In particular, in the terminal fitting obtained by the manufacturing method of the present invention, the insulating layer is formed so as to cover at least the boundary portion between the first metal portion and the third metal portion. Occurrence can be reliably prevented.

In the manufacturing method of the present invention, the metal plate is integrated by cold-welding the first metal material, the second metal material, and the third metal material, and the first metal portion and the first metal material are integrated with each other. The portion where the third metal portion is joined and the portion where the third metal portion and the second metal portion are joined are substantially the same thickness as the other portions and have no steps, so that bending work, etc. Can be easily performed.
As described above, according to the present invention, it is possible to provide a method for manufacturing a terminal fitting that can prevent the occurrence of electrolytic corrosion and can be easily bent.

  Furthermore, in the manufacturing method of the present invention, since the insulating layer forming step of forming the insulating layer is performed before the punching step of punching the metal plate material, the insulating layers of a plurality of terminal fittings can be formed in a lump. There is no need to form each insulating layer in accordance with each terminal fitting, and the terminal fitting can be produced by a simple method.

In the present invention, in the plate material manufacturing step, the first metal material, the second metal material, and the third metal material are bonded to the third metal portion of the first metal portion, and The joint surface of the second metal part with the third metal part is cold-welded and integrated so as to form a stepped cross section .
With such a configuration, even if electrolytic corrosion occurs on the surface in the thickness direction of the terminal fitting obtained by the manufacturing method of the present invention, the distance between the first metal portion and the second metal portion as the electrolytic corrosion progresses. Since it becomes longer, electric corrosion stops halfway. Moreover, by setting it as such a structure, the bending strength in a junction part becomes high and a terminal metal fitting can be made excellent in intensity | strength.
The manufacturing method of the present invention may have the following configuration.

In the plate material manufacturing step, cold pressure welding may be performed by sandwiching a metal foil made of the third metal material between the first metal material and the second metal material.
With such a configuration, a thin film-like third metal part can be formed between the first metal part and the second metal part by a simple method.

After performing the punching step, a plating step of plating a fourth metal whose ionization tendency is closer to the first metal material than the second metal material may be performed.
When the plating process is executed before the punching process, the plating layer is not formed on the end face of the metal plate material formed by the punching process. Therefore, among the end faces formed by the punching process, the end face where the joint part between the first metal part and the third metal part or the joint part between the third metal part and the second metal part is arranged in an exposed state. When water containing an electrolyte adheres, there is a concern about the occurrence of electrolytic corrosion.
Therefore, with the above-described configuration, it is possible to plate the fourth metal closer to the first metal material than the second metal material on the end surface formed by the punching process. .
Therefore, according to the above-described configuration, a layer made of the fourth metal having an ionization tendency closer to the first metal material than the second metal material can be formed on the end face of the metal plate after the punching process is executed. As a result, electrolytic corrosion is less likely to occur, the speed of electrolytic corrosion is suppressed, and the effect of electrolytic corrosion is enhanced.

You may form the said insulating layer by sticking the insulating film which consists of an insulating material on the surface of the metal plate material obtained by execution of the said board | plate material preparation process.
With such a structure, the insulating layer can be formed by a simple method.

  The core wire may be made of aluminum or an aluminum alloy, and the second metal material may be copper or a copper alloy. With such a configuration, the electric wire can be reduced in weight, and the resulting terminal fitting can be excellent in strength.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to prevent generation | occurrence | production of electrolytic corrosion, the terminal metal fitting which can perform a bending process easily, and its manufacturing method can be provided.

Side view of terminal fitting of embodiment 1 Partial plan view showing the wire connection part of the terminal fitting Partial plan view of punched metal sheet Partial plan view of metal sheet 4 is a partial cross-sectional view taken along line XX of FIG. Partial sectional view taken along line XX of FIG. 4 of the metal plate after the insulating layer is formed. Partial plan view of metal plate after insulation layer formation 7 is an enlarged view of the main part of FIG. A plan view showing a part of a terminal fitting with an electric wire placed thereon Partial cross-sectional view of the metal plate constituting the terminal fitting of Reference Example 1 The partial top view of the metal plate material which comprises the terminal metal fitting of Embodiment 2. Partial sectional view taken along line YY in FIG. 11 after the insulating layer is formed Partial cross-sectional view of the metal plate material constituting the terminal fitting of Reference Example 2 Partial sectional drawing of the metal plate material which comprises the terminal metal fitting demonstrated in other embodiment (2)

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In the following description, the left side in FIGS. 1, 2, and 4 to 6 is the front, and the upper side in FIGS. 3 and 7 to 9 is the front.
The terminal fitting 10 of the present embodiment is the female terminal fitting 10 shown in FIGS. 1 and 2, and includes a first metal part 4 and a second metal part 5 in parallel, and the first metal part 4. And a second metal part 5, and a metal plate 1 having a third metal part 6 (details will be described later). The terminal fitting 10 of this embodiment is formed into a shape as shown in FIG. 1 by bending the terminal fitting piece 10A having a developed shape as shown in FIG.

  The terminal fitting 10 includes a main body portion 11 having a substantially box shape that opens forward and backward, and a tab (not shown) of a mating male terminal fitting can be inserted into the main body portion 11 from the front. Yes. On the rear side of the main body portion 11 of the terminal fitting 10, an electric wire connection portion 23 for placing and connecting the electric wires 40 is provided.

  The main body 11 of the terminal fitting 10 is formed in a rectangular tube shape by bending the developed terminal fitting piece 10A shown in FIG. 3 along the folding line L1. The main body 11 includes a bottom wall 13 extending forward and backward, a pair of side walls 14 and 15 raised from both side edges of the bottom wall 13, a ceiling wall 16 that continues from the side wall 14 and faces the bottom wall 13, and a side wall 15. And an outer wall 17 that overlaps the outside of the ceiling wall 16. A support piece 18 projecting toward the side wall 15 is provided at the side edge of the ceiling wall 16, and the support piece 18 is inserted into an insertion groove 19 formed in a cutout in the outer wall 17 and at the side of the insertion groove 19. By contacting the edge (the upper end surface of the side wall 15), the ceiling wall 16 can be supported in a posture substantially parallel to the bottom wall 13.

  An elastic contact piece 20 that can elastically contact the tab is provided from the front end of the bottom wall 13. Although details of the structure of the elastic contact piece 20 are not shown, after the tongue piece 20A extending straight forward from the bottom wall 13 in the unfolded state shown in FIG. The main body 11 is formed by folding forward at a substantially central position in the length direction. A portion between the front and rear folded portions of the elastic contact piece 20 is a tab contact portion 20a that is opposed to the ceiling wall 16 and can be directly contacted with the tab. The portion protruding to the bottom is a support portion 20b that can come into contact with the bottom wall 13, and the tip portion 20c is bent upward in FIG. The elastic contact piece 20 can hold the tab inserted into the main body 11 in a state of being pinched between the ceiling wall 16 and the tab contact portion 20a, and is elastically deformed by being pressed by the tab. At this time, the elastic contact piece 20 is excessively bent by the support portion 20b being in contact with the bottom wall 13 and the tip portion 20c of the support portion 20b being in contact with the back side of the tab contact portion 20a. Can be regulated. The elastic contact piece 20 is formed to be narrower than the bottom wall 13. A locking hole 21 is formed in the bottom wall 13 so that when the terminal fitting 10 is accommodated in a cavity of a housing (not shown), a lance provided in the cavity enters and can be locked. Yes. A pair of stabilizers 22 functioning as guides for the insertion operation into the cavities and the like protrude from both side edges of the locking holes 21 (lower ends of the side walls 14 and 15).

  As shown in FIGS. 2 and 3, the electric wire connecting portion 23 of the terminal fitting 10 is provided to extend rearward from the rear end of the bottom wall 13 of the main body portion 11. An electric wire 40 is placed on the upper surface 23A in FIG. 1 of the electric wire connecting portion 23, and the electric wire 40 is crimped and connected by two sets of barrel pieces 25A and 25B. Hereinafter, the surface on which the electric wire 40 of the terminal fitting 10 is placed is referred to as an electric wire placement surface 23A.

  The electric wire 40 is obtained by coating a core wire 41 formed by twisting metal fine wires (for example, a metal fine wire made of aluminum or an aluminum alloy) with an insulating coating 42 made of an insulating material. Examples of the aluminum alloy used as the material of the electric wire 40 in the present embodiment include JIS standard A5052 aluminum alloy, JIS standard A5083 aluminum alloy, and JIS standard 7000 series aluminum alloy. Of these, JIS standard A5052 aluminum alloy and JIS standard A5083 aluminum alloy are preferable.

  As shown in FIGS. 2 and 9, the terminal 40A of the electric wire 40 is in a state in which the insulating coating 42 is peeled off and the core wire 41 is exposed, and the electric wire 40 has a front end 41A (terminal 41A) of the exposed core wire 41. Is connected to the terminal fitting 10 with the main body 11 facing the side. Of the electric wire connection portion 23, a portion to which the exposed core wire 41 is connected at the terminal 40 </ b> A of the electric wire 40 is the core wire connection portion 24.

  Two pairs of barrel pieces 25A and 25B for connecting the electric wire 40 are extended from the bottom wall 13 of the main body 11 at a distance from each other and project in the width direction of the bottom wall 13 (see FIG. 3). Of the two sets of barrel pieces 25A and 25B, the front (main body 11 side) barrel piece 25B is a core wire barrel piece 25B that is electrically connected to the terminal fitting 10 by crimping the exposed core wire 41, and the rear side. The barrel piece 25 </ b> A on the (rear end side) is an insulating coating barrel piece 25 </ b> A that is connected to the terminal fitting 10 by crimping a portion covered with the insulating coating 42 of the electric wire 40.

A plurality of concave portions 28 for breaking the metal oxide film formed around the core wire 41 when the electric wire 40 is crimped are provided on the electric wire placement surface 23A of the core wire barrel piece 25B (see FIG. 3 and FIG. 3). (See FIG. 8).
The hole edges of the recesses 28 have a parallelogram shape when viewed from the direction penetrating the paper surface of FIG. The plurality of recesses 28 are arranged at intervals in the direction in which the core wire 41 extends in a state where the core wire barrel piece 25B is crimped to the core wire 41, and are arranged at intervals in the direction intersecting the direction in which the core wire 41 extends. (See FIG. 8).

  A region 26 between the core wire barrel piece 25 </ b> B and the rear end of the main body 11 is an end portion arrangement region 26 where the terminal 40 </ b> A of the electric wire 40 is arranged, and this end portion arrangement region 26 is in a state where the electric wire 40 is connected. In FIG. 1, a part (upper side in FIG. 1) is in an open state, and the core wire 41 is arranged in an exposed state (a state visible from the outside) (see FIGS. 1 and 2). A surface 26A (corresponding to the end surface 3 of the metal plate 1) in the plate thickness direction disposed on the upper side in FIG. 1 of the end portion arrangement region 26 is plated.

  A region 27 between the core wire barrel piece 25B and the insulating coating barrel piece 25A is a core wire arrangement region 27 in which the terminal 42A of the insulating coating 42 and the core wire 41 exposed from the terminal 42A of the insulating coating 42 are arranged. Similarly to the arrangement region 26, a part (the upper side in FIG. 1) is in an open state in a state where the electric wire 40 is connected, and the core wire 41 is arranged in an exposed state (a state visible from the outside) (see FIG. 1). 1 and FIG. 2). The surface 27A (corresponding to the end surface 3 of the metal plate 1) in the plate thickness direction disposed on the upper side in FIG. 1 of the core wire arrangement region 27 is plated.

In the terminal fitting 10 of the present embodiment, an insulating layer 29 made of an insulating material 29A is formed on the front end 23E of the wire connecting portion 23. The insulating layer 29 is formed on both the electric wire placement surface 23A (the surface disposed on the upper side in FIG. 1) on which the electric wire 40 is placed and the opposite surface 23B (see FIGS. 1 and 2). reference). The portion covered with the insulating layer 29 is indicated by hatching in the drawing. Since the insulating layer 29 is formed closer to the main body 11 than the front end of the electric wire 40 connected to the electric wire connecting portion 23 (the front end 41A of the core wire 41), it adversely affects the electrical connection between the terminal fitting 10 and the electric wire 40. Never give.
As the insulating material 29A constituting the insulating layer 29, polyethylene terephthalate (PET) or the like can be used. PET is a resin that hardly generates pinholes and is preferable because it has a high effect of preventing electrolytic corrosion.

Next, the metal plate material 1 constituting the terminal fitting 10 of this embodiment will be described.
As shown in FIGS. 4 and 5, the metal plate 1 has a flat plate shape with a substantially constant thickness. The metal plate 1 is made of aluminum or an aluminum alloy (an example of a first metal material), copper or a copper alloy (an example of a second metal material), and nickel or a nickel alloy (an example of a third metal material). It is a clad material obtained by integration by inter-pressure welding, and its thickness is 0.2 mm to 0.3 mm. The metal plate 1 includes a second metal part 5 made of copper or a copper alloy [referred to as “copper (alloy)”] and a first metal part 4 made of aluminum or an aluminum alloy [referred to as aluminum (alloy)] in parallel. In addition, a third metal portion 6 made of nickel or a nickel alloy [referred to as nickel (alloy)] is formed between the first metal portion 4 and the second metal portion 5. In the present embodiment, the thin film-like third metal portion 6 has a thickness of 0.01 mm to 0.10 mm.

  Both the first metal part 4 and the second metal part 5 have a stepped cross section, and are joined with the third metal part 6 in the form of a thin film interposed therebetween. That is, one surface 6A of the thin film-like third metal portion 6 is joined to the stepped surface 9A (joint surface 9A) formed at the end of the first metal portion 4, and the third metal A surface 9B (joint surface 9B) having a stepped cross section formed at the end of the second metal portion is joined to the other surface 6B of the portion 6.

  On both surfaces 1 </ b> A and 1 </ b> B of the metal plate 1, the third metal portion 6 is disposed between the first metal portion 4 and the second metal portion 5 in an exposed state. In the upper side surface 1A (electric wire placement surface) shown in FIG. 6 of the metal plate material 1, the third metal portion 6 is arranged so as to cover the second metal portion 5, and in the lower side surface 1B of the metal plate material 1 Is arranged such that the third metal part 6 covers the first metal part 4. Therefore, the exposed area of the first metal part 4 made of aluminum (alloy) is larger in the electric wire placement surface 1A of the metal plate 1 than in the opposite surface 1B. Therefore, in this embodiment, the distance from the terminal 41 </ b> A of the exposed core wire 41 to the boundary portion 7 between the first metal part 4 and the third metal part 6 is opposite to the wire placing surface 1 </ b> A of the metal plate 1. It is longer than the side surface 1B.

  And on both surfaces 1A and 1B of the metal plate 1, the boundary portion 7 between the first metal portion 4 and the third metal portion 6, the third metal portion 6, and the third metal portion 6 and the An insulating layer 29 is formed so as to cover the boundary portion 8 between the two metal portions 8.

Next, the manufacturing method of the terminal metal fitting 10 of this embodiment is demonstrated.
First, the metal plate material 1 used as the material of the terminal metal fitting 10 is produced (plate material production process). Specifically, a first metal material containing aluminum (alloy), a second metal material made of copper (alloy), a metal foil made of nickel (alloy) (a metal foil made of a third metal material) 1) is integrated by cold pressure welding, and as shown in FIG. 5, the first metal part 4 and the second metal part 5 are provided in parallel, and the first metal part 4 and the first metal part 4 A flat clad material provided with the third metal part 6 between the two metal parts 5 is produced.

  Next, an insulating layer forming step for forming the insulating layer 29 on the surfaces 1A and 1B of the metal plate 1 obtained by executing the plate material manufacturing step is executed (insulating layer forming step). Specifically, as shown in FIGS. 4 and 6, the insulating film 29 </ b> A (insulating material 29 </ b> A) is applied to the entire area of the third metal portion 6 on the upper and lower surfaces 1 </ b> A and 1 </ b> B of the metal plate 1 (first Affixing so as to cover the boundary part 7 between the metal part 4 and the third metal part 6, the third metal part 6, and the boundary part 8 between the third metal part 6 and the second metal part 5) Thus, the insulating layer 29 is formed.

  Next, when the metal plate 11 is punched along the dotted line shown in FIG. 7 (punching step), the chain terminal 30 having the shape shown in FIG. 3 is obtained. The dotted line shown in FIG. 7 indicates the shape (predetermined shape) of the chain terminal 30 in which a plurality of terminal metal pieces 10A are connected. In the present embodiment, almost the entire area of the main body 11 is formed on the second metal part 5, and almost the entire area of the wire connection part 23 is formed on the first metal part 4 of the metal plate 1. As shown, a punching process is performed.

  Next, when a plurality of concave portions 28 are formed by pressing the wire mounting surface 23A of the core wire barrel piece 25B using a mold in which a plurality of convex portions (not shown) are formed to protrude, the shape is shown in FIG. A chain terminal 30 is obtained.

  In the chain terminal 30 (metal plate material obtained after execution of the punching process), a plurality of terminal fitting pieces 10 </ b> A are connected to the carriers 31 and 35. As shown in FIG. 3, the chain terminal 30 has a plurality of terminal fitting pieces 10 </ b> A in the illustrated horizontal direction, that is, the carriers 31, 35 of the pair of carriers 31, 35 extending in the illustrated horizontal direction. It is set as the structure connected in the state located in a line at substantially equal intervals along the longitudinal direction (extending direction). Each terminal fitting piece 10A has a longitudinal direction in the vertical direction shown in the drawing, that is, a position along the width direction of the chain terminal 30, and each of the front and rear ends is one of the width directions of the carriers 31 and 35, respectively. Connected to the edge.

  The front end portion of the terminal metal piece 10A is connected to the upper carrier 31 in FIG. The distal end portion 20 c of the elastic contact piece 20 formed at the front end portion of the terminal fitting piece 10 </ b> A is formed at a position where it enters the width region of the carrier 31. The connecting portion 32 and the carrier 31 that connect the front end portion of the terminal metal piece 10A are arranged side by side in the illustrated horizontal direction.

  The rear end portion of the terminal metal piece 10A is connected to a connecting portion 36 protruding from the side edge of the lower carrier 35 in FIG. The connecting portion 36 is connected to the center of the rear end width direction of the insulating coating barrel piece 25A in the terminal fitting piece 10A. The terminal metal piece 10A, the connecting portion 36, and the carrier 35 are arranged side by side in the illustrated vertical direction, that is, in the width direction when viewed from the entire chain terminal 30. The carrier 35 is formed with feed holes 33 and 34 that can be engaged with feed claws (not shown) provided in the processing machine for feeding the chain terminal 30. Since the feed holes 33 and 34 have different feed claws depending on the type of processing machine (for example, a press or a crimping machine), the circular feed holes 33 and the square feed holes 34 are formed according to the shape of the feed claws. Two types are provided.

Next, plating is performed on the chain terminal 30 (metal plate material obtained after execution of the punching process) obtained through the punching process (plating process).
In the plating step, not only the both surfaces of the chain terminal 30 are plated, but also the surface (end surface 3) in the plate thickness direction of the chain terminal 30 (metal plate material 1) is plated.
In the plating step, a fourth metal (for example, tin or nickel) having a higher ionization tendency than the second metal material [copper (alloy)] constituting the second metal portion 5 is plated. In the present embodiment, tin is preferable as the fourth metal.
After the plating step, plating layers are formed on both surfaces 1A and 1B and the end surface 3 of the metal plate 1 constituting the terminal fitting 10.

  Next, by engaging the feed claws with the feed holes 33 and 34 formed in the carriers 31 and 35, the terminal fitting pieces 10A are sequentially sent to the processing machine, and the terminal fitting pieces 10A are bent in the process. Apply. In the present embodiment, the thickness of the metal plate 1 is generally constant, and therefore the portion where the first metal portion 4 and the third metal portion 6 are joined, or the third metal portion 6 and the second metal portion 5. The bending process can be easily performed even in the portion where the two are joined.

  Next, the insulating metal barrel piece 25A and the core wire barrel piece 25B provided in the electric wire connection portion 23 of each terminal fitting piece 10A are crimped to the electric wire 40, and the terminal fitting 10 and the electric wire 40 are connected. Specifically, as shown in FIG. 9, the electric wire 40 is arranged such that the front end 41 </ b> A (terminal 41 </ b> A) of the core wire 41 is arranged in the end arrangement region 26 of the electric wire connecting portion 23, and the terminal 42 </ b> A of the insulating coating 42 is provided. When the core wire barrel piece 25B and the insulating coating barrel piece 25A are respectively crimped to the electric wire 40 after being placed so as to be arranged in the core wire arrangement region 27, the terminal fitting 10 having the shape shown in FIGS. 1 and 2 is obtained. It is done.

Next, the effect of this embodiment will be described.
In this embodiment, the electric wire connection part 23 including the core wire connection part 24 is formed in the first metal part 4 made of the first metal material. Therefore, since the core wire 41 exposed at the terminal 40A of the electric wire 40 and the core wire connecting portion 24 to which the core wire 41 is connected are made of the same metal material, the electrolyte is applied to the portion where the core wire 41 and the terminal fitting 10 are in contact with each other. Even if moisture containing water adheres, electric corrosion does not occur.

  In the present embodiment, a third ionization tendency is formed between the first metal part 4 and the second metal part 5, and the ionization tendency is made of a metal material between the first metal material and the second metal material. Since the metal part 6 is provided, the boundary portion of the dissimilar metal (between the first metal part 4 and the third metal part 6 is compared with the case where the first metal part 4 and the second metal part 5 are joined. Electrolytic corrosion is unlikely to occur at the boundary portion 7 and at the boundary portion 8) between the third metal portion 6 and the second metal portion 5. As a result, according to the present embodiment, electrolytic corrosion is unlikely to occur at portions where different metal materials are joined.

In the present embodiment, the metal plate 1 constituting the terminal fitting 10 is integrated by cold-welding the first metal material, the second metal material, and the third metal material. The part where the metal part 4 and the third metal part 6 are joined and the part where the third metal part 6 and the second metal part 5 are joined are substantially the same thickness as the other parts. Since there is no step, bending and the like can be performed easily.
As mentioned above, according to this embodiment, while being able to prevent generation | occurrence | production of electrolytic corrosion, the terminal metal fitting 10 which can give a bending process easily can be provided.

  According to this embodiment, the joint surface 9A of the first metal part 4 with the third metal part 6 and the joint surface 9B of the second metal part 5 with the third metal part 6 are stepped in cross section. Therefore, even if electrolytic corrosion occurs on the surface in the thickness direction of the terminal fitting, the distance between the first metal part 4 and the second metal part 5 becomes longer as the electrolytic corrosion progresses. Stop halfway. Moreover, according to this embodiment, the bending strength in a junction part becomes high and can make the terminal metal fitting 10 excellent in intensity | strength.

  In addition, according to the present embodiment, in the plate material manufacturing step, since the metal foil made of the third metal material is sandwiched between the first metal material and the second metal material, the cold pressure welding is performed. By the method, a thin film-like third metal part 6 can be formed between the first metal part 4 and the second metal part 5.

In the present embodiment, the insulating layer 29 made of an insulating material includes the boundary portion 7 between the first metal portion 4 and the third metal portion 6, the third metal portion 6, and the third metal portion 6. And a boundary portion 8 between the second metal portion 5 and the second metal portion 5.
Therefore, according to this embodiment, the electrolytic corrosion at the boundary portion 7 between the first metal portion 4 and the third metal portion 6 and at the boundary portion 8 between the third metal portion 6 and the second metal portion 5 is performed. Can be prevented.

  Furthermore, in this embodiment, the insulating layer 29 is bonded to the insulating film 29A made of an insulating material so as to cover the entire area of the third metal portion 6 on the upper and lower surfaces 1A and 1B of the metal plate 1. Therefore, the insulating layer 29 can be formed by a simple method.

  Furthermore, according to this embodiment, since the insulating layer forming step for forming the insulating layer 29 is performed before the punching step for punching the metal plate material 1, the insulating layers 29 of the plurality of terminal fittings 10 are collectively formed. Therefore, it is not necessary to form each insulating layer 29 in accordance with each terminal fitting 10, and the terminal fitting 10 can be produced by a simple method.

  In the present embodiment, the terminal fitting 1 is plated with a fourth metal (tin) that has a higher ionization tendency than the second metal material [copper (alloy)]. In particular, in this embodiment, since the plating process for plating the fourth metal is performed after the punching process is performed, the end surface 3 of the metal plate 1 formed by the punching process is also plated. . That is, according to this embodiment, the end surface on which the joint portion between the first metal portion 4 and the third metal portion 6 and the joint portion between the third metal portion 6 and the second metal portion 5 are arranged in an exposed state. 3 can be plated with the fourth metal, so that it is difficult for electrolytic corrosion to occur at the joint portion where the different metal exists, and the speed of electrolytic corrosion is suppressed, and the electrolytic corrosion prevention effect is enhanced.

  Furthermore, in this embodiment, since the plating step is performed after the insulating layer forming step is performed, the insulating layer 29 is formed on the metal plate 1 than when the insulating layer 29 is formed after the plating step is performed. Easy to work and excellent workability.

  In addition, according to the present embodiment, the core wire 41 is made of aluminum or an aluminum alloy, and the second metal material is copper or a copper alloy. Therefore, the electric wire 40 can be reduced in weight, and the terminal fitting 10 is strengthened. It can be made excellent.

< Reference Example 1>
The terminal fitting of Reference Example 1 will be described with reference to FIG. In the metal plate 1 ′ constituting the terminal fitting of Reference Example 1, the joining surface 9 </ b> A of the first metal part 4 with the third metal part 6 is an inclined surface, and the third metal of the second metal part 5. The joint surface 9B with the part 6 is an inclined surface. Other configurations are substantially the same as those of the first embodiment.

Also in the reference example 1, as in the first embodiment, the third metal portion 6 replaces the second metal portion 5 on the upper side surface 1′A (wire placing surface) of the metal plate 1 ′ shown in FIG. The third metal part 6 is arranged so as to cover the first metal part 4 on the lower surface 1 ′ B of the metal plate 1 ′.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIGS. 11 and 12. The second embodiment is different from the first embodiment in that the exposed area of the third metal portion 6 is smaller in the upper side surface 100A and the lower side surface 100B shown in FIG. 11). In the following description, the same components as those of the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  In the upper side surface 100A (electrical wire mounting surface) and the lower side surface 1B shown in FIG. 12 of the metal plate member 100, the first metal portion 4 and the second metal portion with the third metal portion 6 exposing only the end surface. 5 is joined. Other configurations are almost the same as those of the first embodiment.

Also in the present embodiment, as in the first embodiment, the bonding surface 9A of the first metal portion 4 with the third metal portion 6 and the bonding surface 9B of the second metal portion 5 with the third metal portion 6 are used. Since the cross section has a stepped shape, the distance between the first metal portion 4 and the second metal portion 5 becomes longer as the electrolytic corrosion progresses even if electrolytic corrosion occurs on the surface in the thickness direction of the terminal fitting. Therefore, electric corrosion stops on the way. Moreover, according to this embodiment, the bending strength in a junction part becomes high and can make the terminal metal fitting 10 excellent in intensity | strength.
Furthermore, according to this embodiment, the usage-amount of the 3rd metal material which comprises a 3rd metal part can be decreased.

< Reference Example 2>
The terminal fitting of Reference Example 2 will be described with reference to FIG. In the metal plate 100 ′ constituting the terminal fitting of Reference Example 2, the joining surface 9 </ b> A of the first metal part 4 with the third metal part 6 is an inclined surface, and the third metal of the second metal part 5. The joint surface 9B with the part 6 is an inclined surface. Other configurations are substantially the same as those of the second embodiment.

Also in the reference example 2, as in the second embodiment, only the end surface of the third metal portion 6 is exposed on the upper side surface 100A (electric wire placement surface) and the lower side surface 1B of the metal plate 100 shown in FIG. In the state, it is joined to the first metal part 4 and the second metal part 5.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the said embodiment, although the punching process was performed so that the substantially whole area of an electric wire connection part might be formed in the 1st metal part of a metal plate material, only a core wire connection part is the 1st among electric wire connection parts. You may perform a punching process so that it may form in a metal part.

(2) In the embodiment and the reference example, the example in which the metal foil made of nickel (alloy) is used as the third metal material constituting the third metal portion is shown. However, the third metal material has an ionization tendency. May be between the second metal material and the first metal material.
Moreover, in the said embodiment and the modification, although the metal plate obtained by cold-welding together with the 1st metal material and the 2nd metal material using metal foil as a 3rd metal material was used, the 3rd metal The material is not limited to metal foil.
The third metal material is plated on the second metal material or the first metal material in advance, and the first metal material and the second metal material are plated on the surface on which the third metal material is plated. An integrated metal plate material may be used.
As a reference form, for example, as shown in FIG. 14, there is a metal plate 110 produced using a massive material as the third metal material. In this metal plate 110, the first metal part 4, the third metal part 6 and the second metal part 5 are joined in parallel with the same thickness.

(3) In the embodiment and the reference example, the shape of the joint surface 9A of the first metal part 4 with the third metal part 6 and the joint surface 9B of the second metal part 5 with the third metal part 6 are as follows. Indicates a stepped section or an inclined surface .

  (4) In the above embodiment, the insulating layer is formed by sticking a PET film on both surfaces of the metal plate material. However, the insulating layer may not be formed, or another such as polybutylene terephthalate (PBT) may be used. The insulating material may be used. Further, the insulating layer may be formed of different insulating materials on the front side and the back side of the metal plate material, or may be formed by a method of applying a liquid insulating material and performing heat treatment.

  (5) In the above embodiment, since an electric wire including an aluminum (alloy) core wire is used, aluminum (alloy) is used as the first metal material, and copper (alloy) is used as the second metal material. Although a metal plate is shown, the present invention is not limited to this. The first metal material may be the same metal material as the core wire of the electric wire, and the second metal material may be a metal material different from the first metal material.

  (6) In the said embodiment, the example which used the metal (tin or nickel) whose ionization tendency is larger than copper (2nd metal material) is shown as a metal (3rd metal) for plating. However, it is not limited to this. If the third metal for plating is closer to the first metal material than the second metal material, the third metal for plating is preferable because the effect of preventing electrolytic corrosion is enhanced.

  (7) In the said embodiment, although what plated the metal plate material on both surfaces and the end surface was shown, it is not limited to this. For example, it may be a terminal metal fitting made using a metal plate material that has not been plated, or a metal plate material that has been plated only on one surface or a metal plate material that has been punched. It may be what you did.

  (8) In the above embodiment, the manufacturing method for performing the plating process after the punching process has been described. However, the plating process may be performed before the punching process. Even in this case, if the end face of the plate material formed by punching is plated after the punching step, the effect of preventing electrolytic corrosion can be enhanced.

(9) In the above embodiment, the core wire barrel piece is formed with a plurality of concave portions having a parallelogram shape. However, the shape of the concave portion may be rectangular.
(10) In the above embodiment, the method of forming the plurality of recesses after the punching process has been described. However, the plurality of recesses may be formed before the punching process or simultaneously with the punching process.

  (11) Although the female terminal is shown as the terminal fitting in the above embodiment, a male terminal may be used. Moreover, although the terminal metal fitting provided with the main-body part which can insert the other party metal fitting was shown in the said embodiment, what has a wire connection part which connects two or more electric wires (what is called a "splice terminal") may be used. .

DESCRIPTION OF SYMBOLS 1 ... Metal plate material 1A, 1B ... Surface (of metal plate material) 3 ... End surface (of metal plate material) 4 ... 1st metal part 5 ... 2nd metal part 6 ... 3rd metal part 7 ... (1st metal) Boundary portion between the metal portion and the third metal portion 8... Boundary portion between the third metal portion and the second metal portion 9A... Bonding surface 9B between the first metal portion and the third metal portion 9B. Joint surface of second metal portion with third metal portion 10... Terminal fitting 23. Electric wire connection portion 23 A... Electric wire placement surface 24. Core wire connection portion 25 A. Insulation coating barrel piece 25 B. 29A ... Insulating material 40 ... Electric wire 40A ... (Electric wire) terminal 41 ... Core wire 41A ... (Core wire) terminal 42 ... Insulating coating

Claims (9)

A terminal fitting having a wire connecting portion for placing and electrically connecting an electric wire formed by coating a core wire with an insulating coating,
A first metal material containing the same metal as the metal material contained in the core wire, a second metal material made of a metal different from the first metal material, and an ionization tendency of the second metal material and the Obtained by integrating the third metal material made of metal between the first metal material by cold pressure welding, and
The first metal part made of the first metal material and the second metal part made of the second metal material are provided in parallel, and the first metal part and the second metal part are provided. Between, it is comprised from the metal plate material provided with the 3rd metal part which consists of said 3rd metal material,
Of the wire connection portions, at least a core wire connection portion to which the core wire exposed from the end of the wire is connected is formed in the first metal portion ,
The joint surface of the first metal part with the third metal part and the joint surface of the second metal part with the third metal part have a stepped cross section. Terminal fitting. The terminal fitting according to claim 1, wherein an insulating layer made of an insulating material is formed so as to cover at least a boundary portion between the first metal portion and the third metal portion . The terminal fitting according to claim 2 , wherein the insulating layer is formed so as to cover a boundary portion between the third metal portion and the second metal portion . The terminal fitting according to any one of claims 1 to 3 , wherein the core wire is made of aluminum or an aluminum alloy, and the second metal material is copper or a copper alloy . A method of manufacturing a terminal fitting having an electric wire connecting portion for placing and electrically connecting an electric wire formed by coating a core wire with an insulating coating,
  A first metal material containing the same metal as the metal material contained in the core wire, a second metal material made of a metal different from the first metal material, and an ionization tendency of the second metal material and the A third metal material made of a metal between the first metal material and a first metal part made of the first metal material by integrating a third metal material made of metal between the first metal material by cold pressure welding and the second metal A metal having a second metal part made of a material in parallel and a third metal part made of the third metal material between the first metal part and the second metal part. After executing the plate material production process to produce the plate material,
  Performing an insulating layer forming step of forming an insulating layer made of an insulating material so as to cover at least a boundary portion between the first metal portion and the third metal portion;
  The metal plate material after performing the insulating layer forming step is a portion corresponding to a core wire connection portion to which at least the core wire exposed from the end of the electric wire is connected among the electric wire connection portions. Performing a punching process of punching so as to be formed in one metal part,
  In the plate material manufacturing step, the first metal material, the second metal material, and the third metal material may be combined with a bonding surface of the first metal portion with the third metal portion, and the second metal material. The manufacturing method of the terminal metal fitting which cold-welds and integrates so that the joint surface with the said 3rd metal part of this metal part may make a cross-sectional step shape. In the plate producing step, between the first metallic material and the second metallic material, in claim 5, characterized in that the cold weld across a metal foil made of the third metal material The manufacturing method of the terminal metal fitting of description . After performing the punching step, a plating step is performed in which a fourth metal having an ionization tendency larger than that of the second metal material and closer to the first metal material than the second metal material is performed. The manufacturing method of the terminal metal fitting of Claim 5 or Claim 6 characterized by the above-mentioned. The said insulating layer is formed by sticking the insulating film which consists of an insulating material on the surface of the metal plate material obtained by execution of the said board | plate material preparation process, The any one of Claim 5 thru | or 7 characterized by the above-mentioned. The manufacturing method of the terminal metal fitting as described in a term . The method for manufacturing a terminal fitting according to any one of claims 5 to 8, wherein the core wire is made of aluminum or an aluminum alloy, and the second metal material is copper or a copper alloy. .

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